Big Blue River at Shelbyville, IN
USGS Site No: 03361500 • Big Blue River • Shelby County, IN
Big Blue River at Shelbyville, IN on the Big Blue River is currently at 1,460 cfs (Very High — 113th percentile for this date) . Gage height: 7.72 ft.
Reading from
Historical Percentile Comparison
Today's discharge compared to the long-term record for October 28 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.
| Percentile | Label | CFS Threshold | Today's Flow |
|---|---|---|---|
| 10th | Very Low threshold | 71 | |
| 25th | Low threshold | 86 | |
| 50th (Median) | Normal (median) | 123 | |
| 75th | High threshold | 182 | |
| 95th | Very High threshold | 530 |
30-Day Hydrograph
Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.
30-Day Flow History
| Date | Discharge (CFS) | Gage Ht (ft) |
|---|---|---|
| May 28, 2026 | 3,830 | — |
| May 27, 2026 | 1,460 | — |
| May 26, 2026 | 825 | — |
| May 25, 2026 | 1,050 | — |
| May 24, 2026 | 1,430 | — |
| May 23, 2026 | 1,620 | — |
| May 22, 2026 | 1,630 | — |
| May 21, 2026 | 2,810 | — |
| May 20, 2026 | 3,350 | — |
| May 19, 2026 | 4,030 | — |
| May 18, 2026 | 729 | — |
| May 17, 2026 | 387 | — |
| May 16, 2026 | 414 | — |
| May 15, 2026 | 444 | — |
| Apr 21, 2026 | 194 | — |
| Apr 20, 2026 | 202 | — |
| Apr 19, 2026 | 214 | — |
| Apr 18, 2026 | 217 | — |
| Apr 17, 2026 | 220 | — |
| Apr 16, 2026 | 231 | — |
| Apr 15, 2026 | 235 | — |
| Apr 14, 2026 | 237 | — |
| Apr 13, 2026 | 243 | — |
| Apr 12, 2026 | 246 | — |
| Apr 11, 2026 | 258 | — |
| Apr 10, 2026 | 273 | — |
| Apr 9, 2026 | 282 | — |
| Apr 8, 2026 | 298 | — |
| Apr 7, 2026 | 328 | — |
| Apr 6, 2026 | 370 | — |
Station Information
- USGS Site No
- 03361500
- State
- IN
- County
- Shelby County
- Coordinates
- 39.5293, -85.7775
- Drainage Area
- 421 mi²
- Datum (ft)
- 737.2
- HUC Code
- 05120204
Flood Stage Thresholds
- Action Stage
- 9.0 ft
- Flood Stage
- 13.0 ft
- Moderate Flood
- 15.0 ft
- Major Flood
- 18.0 ft
Currently 5.28 ft below flood stage.
Recent Extremes
- Max discharge
-
7,530 cfsMar 5, 2026
- Min discharge
-
63 cfsSep 21, 2025
- Days at flood stage
- 0
Computed from the local daily-values archive.
Nearby Gauges
-
Brandywine Creek Near Fairland, INVery High4.4 mi · 254 cfs
-
Buck Creek at Acton, INHigh13.0 mi · 141 cfs
-
Sugar Creek at New Palestine, INHigh14.0 mi · 113 cfs
-
Big Blue River at Carthage, INHigh18.3 mi · 141 cfs
-
Lick Creek at Indianapolis, INHigh21.2 mi · 13 cfs